Seamless steel pipe for oil wells excellent in sulfide stress cracking resistance and method for producing the same

a technology of seamless steel pipe and oil well, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of deteriorating increasing energy consumption, and deteriorating production efficiency, and achieve excellent sulfide stress cracking resistance and high yield ratio. , the effect of high strength

Inactive Publication Date: 2006-11-30
SUMITOMO METAL IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011] From the point of the above-mentioned present situation, the present invention has an object to provide a high strength seamless steel pipe for oil wel...

Problems solved by technology

Accordingly, the sulfide stress cracking resistance is generally deteriorated against the enhancement in strength of the steel product used in a hydrogen sulfide-rich environment.
Although it is preferable to make the steel product into a uniform tempered martensitic microstructure for increasing the yield ratio of the steel, that alone is insufficient.
However, the refinement...

Method used

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  • Seamless steel pipe for oil wells excellent in sulfide stress cracking resistance and method for producing the same
  • Seamless steel pipe for oil wells excellent in sulfide stress cracking resistance and method for producing the same

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embodiment

PREFERRED EMBODIMENT

[0083] The present invention will be described in more detail in reference to preferred embodiments.

example 1

[0084] Billets with an outer diameter of 225 mm formed of 28 kinds of steels shown in Table 3 were produced. These billets were heated to 1250 degrees centigrade, and formed into seamless steel pipes with 244.5 mm outer diameter and 13.8 mm thickness by the Mannesmann-mandrel tube-making method.

[0085] [Table 3]

TABLE 3Chemical composition (mass %) The balance: Fe and impuritiesSteelCSiMnPSCrMoBsol. AlN10.120.260.910.0100.0020.430.350.00120.0240.003920.110.330.610.0100.0040.610.510.00210.0260.003830.150.220.610.0100.0040.300.500.00120.0250.004140.200.250.600.0100.0040.310.500.00130.0290.004050.170.300.600.0100.0040.610.450.00120.0320.003660.130.230.630.0100.0040.600.610.00030.0310.001870.130.400.750.0110.0040.360.580.00120.0280.003780.160.300.800.0110.0040.300.510.00110.0280.004390.150.190.820.0100.0040.250.400.00100.0300.0047100.150.630.400.0100.0040.600.300.00150.0290.0041110.160.190.620.0100.0040.890.160.00190.0310.0043120.140.220.440.0080.0040.880.360.00100.0300.0035130.140.190.6...

example 2

[0104] Billets with an outer diameter of 225 mm formed of 3 kinds of steels shown in Table 5 were produced. These billets were heated to 1250 degrees centigrade, and formed into seamless steel pipes with 244.5 mm outer diameter and 13.8 mm thickness by the Mannesmann-mandrel tube-making method. The steels Nos. 29 to 31 in Table 5 satisfied the chemical composition defined by the present invention.

[0105] [Table 5]

TABLE 5Chemical composition (mass %) The balance: Fe and impuritiesSteelCSiMnPSCrMoBsol. AlN290.150.150.760.0100.0020.350.400.00130.0250.0032300.190.210.610.0100.0020.450.300.00090.0210.0038310.140.320.660.0080.0010.410.710.00120.0250.0041Chemical composition (mass %) The balance: Fe and impuritiesA-Ac1Ac3SteelTiNbVCaMgREMvaluepointpoint290.016—0.070.0018——0.480750872300.013—0.10—0.0008—0.482752855310.013—0.120.0020—0.00050.569761900

A = C + (Mn / 6) + (Cr / 5) + (Mo / 3).

In the columns both “Ac1 point” and “Ac3 point”, the temperature unit is “degrees centigrade”.

[0106] Each fo...

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Abstract

A high-strength seamless steel pipe for oil wells excellent in sulfide stress cracking resistance which comprises, on the percent by mass basis, C: 0.1 to 0.20%, Si: 0.05 to 1.0%, Mn: 0.05 to 1.0%, Cr: 0.05 to 1.5%, Mo: 0.05 to 1.0%, Al: 0.10% or less, Ti: 0.002 to 0.05% and B: 0.0003 to 0.005%, with a value of equation “C+(Mn/6)+(Cr/5)+(Mo/3)” of 0.43 or more, with the balance being Fe and impurities, and in the impurities P: 0.025% or less, S: 0.010% or less and N: 0.007% or less. The seamless steel pipe may contain a specified amount of one or more element(s) of V and Nb, and/or a specified amount of one or more element(s) of Ca, Mg and REM. The seamless steel pipe can be produced at a low cost by adapting an in-line tube making and heat treatment process having a high production efficiency since a reheating treatment for refinement of grains is not required.

Description

[0001] This application is a continuation of the international application PCT / JP2005 / 001186 filed on Jan. 28, 2005, the entire content of which is herein incorporated by reference.TECHNICAL FIELD [0002] The present invention relates to a high strength seamless steel pipe which is excellent in sulfide stress cracking resistance and a method for producing the same. More specifically, the present invention relates to a seamless steel pipe for oil wells having a high yield ratio and also excellent sulfide stress cracking resistance, which is produced by the method of quenching and tempering for a specified component-based steel. [0003]“An oil well” in the present specification includes “a gas well”, and so, the meaning of “for oil wells” is “for oil and / or gas wells”. BACKGROUND ART [0004] A seamless steel pipe, which is more reliable than a welded pipe, is frequently used in a sever oil well environment or high-temperature environment, and the enhancement of strength, improvement in t...

Claims

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Application Information

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IPC IPC(8): C21D9/08C22C38/32C21D1/18C21D8/10C22C38/00
CPCC21D1/18C21D9/085C21D8/105C22C38/22C21D2211/008C21D9/08C21D8/10C22C38/02C22C38/04
Inventor ARAI, YUJIOMURA, TOMOHIKONAKAMURA, KEIICHI
Owner SUMITOMO METAL IND LTD
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